CN-121993239-A - Quick grouting constant-resistance large-deformation anchor rod, anchoring device and method

CN121993239ACN 121993239 ACN121993239 ACN 121993239ACN-121993239-A

Abstract

The invention discloses a rapid grouting constant-resistance large-deformation anchor rod, an anchoring device and a method, which relate to the field of geotechnical engineering, wherein the constant-resistance large-deformation anchor rod comprises a grouting pipe, a solid anchor rod body and a spiral drill bit, the solid anchor rod body is coaxially arranged in the grouting pipe, and one end of the solid anchor rod body extends out of the grouting pipe and is connected with the spiral drill bit; the grouting pipe is detachably connected with a grouting stop sleeve corresponding to the extending end of the solid anchor rod body, one end, far away from the spiral drill bit, of the grouting pipe is provided with a grouting joint, and the grouting joint is used for connecting grouting equipment so as to inject grout into the grouting pipe. The invention solves the problems of easy blockage of grouting holes, poor grouting effect, lower construction efficiency and the like in the existing anchor rod construction, and improves the construction efficiency and the anchoring quality.

Inventors

ZHANG YONG
ZHANG XIAOWEI
SUN XIAOMING
YU XUEQIAN
HE LINSEN
SHI FUKUN
MIAO CHENGYU
WANG HAOXUAN

Assignees

中国矿业大学(北京)
中国地质大学（北京）

Dates

Publication Date: 20260508
Application Date: 20260327

Claims (10)

1. A quick grouting constant-resistance large-deformation anchor rod is characterized by comprising a grouting pipe, a solid anchor rod body and a spiral drill bit, wherein the solid anchor rod body is coaxially arranged in the grouting pipe, one end of the solid anchor rod body extends out of the grouting pipe and is connected with the spiral drill bit, the grouting pipe is detachably connected with a grouting stop sleeve corresponding to the extending end of the solid anchor rod body, one end, far away from the spiral drill bit, of the grouting pipe is provided with a grouting joint, and the grouting joint is used for being connected with grouting equipment so as to inject grout into the grouting pipe.
2. The rapid grouting constant-resistance large-deformation anchor rod according to claim 1, wherein the grouting plug sleeve is in a shape of a circular truncated cone, the narrow end of the grouting plug sleeve faces the spiral drill bit, and the wide end of the grouting plug sleeve is connected with the grouting pipe through a plurality of connecting pieces.
3. A rapid grouting constant resistance large deformation anchor according to claim 1 or 2, wherein the inner diameter of the grout stop sleeve is 2-5 mm larger than the diameter of the solid anchor body.
4. A rapid grouting constant resistance large deformation anchor according to claim 1, wherein after grouting is completed, the grouting pipe is removed and the grout stop sleeve is retained to the tail of the solid anchor body.
5. The rapid grouting constant-resistance large-deformation anchor rod according to claim 4, wherein the grout stop sleeve is plugged by a rubber plug, and a backing plate and a nut are sequentially arranged on the rear side of the rubber plug.
6. A rapid grouting anchoring device comprising a constant resistance large deformation anchor according to any one of claims 1 to 5.
7. The rapid grouting anchoring device of claim 6, further comprising a grouting apparatus having grouting nozzles connected to the grouting joints.
8. The construction method of the rapid grouting constant-resistance large-deformation anchor rod according to any one of claims 1 to 5, which is characterized by comprising the following steps: driving the anchor rod into surrounding rock, and connecting a grouting joint and grouting equipment; After the sealing is complete, starting grouting equipment to perform grouting, wherein grouting is stopped until the grouting stop sleeve is exposed from surrounding rock by adopting a mode of grouting while pumping a grouting pipe; the grouting pipe is disassembled, and the grouting plug sleeve is plugged by the rubber plug.
9. The construction method of the rapid grouting constant-resistance large-deformation anchor rod is characterized in that a backing plate and a nut are sequentially arranged on the outer side of a rubber plug, and the anchor rod is tightly attached to surrounding rock by tightening the nut to apply pretightening force to the anchor rod.
10. The construction method of the rapid grouting constant-resistance large-deformation anchor rod according to claim 8, wherein after grouting equipment is connected with the grouting joint, if a pressure value displayed by a pressure gauge on the grouting equipment exceeds a preset value, a sealing belt is wound at the joint of the grouting equipment and the grouting joint.

Description

Quick grouting constant-resistance large-deformation anchor rod, anchoring device and method Technical Field The invention relates to the field of geotechnical engineering, in particular to a rapid grouting constant-resistance large-deformation anchor rod, an anchoring device and a method. Background The statements in this section merely provide background information related to the present patent and may not necessarily constitute prior art. In the field of geotechnical engineering, an anchor rod is used as an important supporting tool and is widely applied to scenes such as side slope reinforcement, tunnel supporting, coal mine roadway supporting and the like. The traditional anchor rod construction process generally involves a plurality of independent steps of drilling, pulling out a drill rod, inserting an anchor rod and grouting, and the step-by-step construction mode has various defects such as low construction efficiency, high construction cost, difficult guarantee of grouting effect and the like. In recent years, the self-drilling grouting anchor rod technology has been developed, and drilling, grouting and anchoring functions are integrated, so that the construction efficiency and the anchoring quality are improved. However, existing self-drilling grouting anchors still have some disadvantages: In the prior art, the grouting anchor rod mostly adopts a hollow structure, a grouting opening is usually arranged at the bottom of an anchor head or on the side wall of a rod body, and in the process of drilling and installing the anchor rod, a grouting hole is easily blocked by drilling cuttings, rock slag or slurry, so that a grouting channel is not smooth, and grouting efficiency is influenced. In addition, the existing grout stopping device mostly adopts a simple rubber plug, a plastic grout stopping plug or a slip type grout stopping structure, wherein the plastic grout stopping plug is poor in adaptability to the surface of an injected concrete layer, grout stopping capability is difficult to meet the standard requirement, grout leakage rate is high, slip type grout stopping plug construction process is complex, construction efficiency can be reduced, the traditional rubber plug is easy to deform and fall off under high grouting pressure, structural stability is poor, grouting pressure cannot be guaranteed, grout is easy to flow back from a gap between a rod body and the grout stopping device, and anchoring effect is affected. Therefore, the existing grouting anchor rod has poor grout stopping sealing effect. Disclosure of Invention Aiming at the defects existing in the prior art, the invention aims to provide a rapid grouting constant-resistance large-deformation anchor rod, an anchoring device and a method, which solve the problems of easy blockage of grouting holes, poor grouting effect, lower construction efficiency and the like in the existing anchor rod construction and improve the construction efficiency and the anchoring quality. In order to achieve the above object, the present invention is realized by the following technical scheme: According to the first aspect, the embodiment of the invention provides a rapid grouting constant-resistance large-deformation anchor rod, which comprises a grouting pipe, a solid anchor rod body and a spiral drill bit, wherein the solid anchor rod body is coaxially arranged in the grouting pipe, one end of the solid anchor rod body extends out of the grouting pipe and is connected with the spiral drill bit, the grouting pipe is detachably connected with a grouting stop sleeve corresponding to the extending end of the solid anchor rod body, one end, far away from the spiral drill bit, of the grouting pipe is provided with a grouting joint, and the grouting joint is used for being connected with grouting equipment so as to inject grout into the grouting pipe. As a further implementation manner, the grouting plug sleeve is in a truncated cone shape, the narrow end of the grouting plug sleeve faces the spiral drill bit, and the wide end of the grouting plug sleeve is connected with the grouting pipe through a plurality of connecting pieces. As a further implementation mode, the inner diameter of the grout stop sleeve is 2-5 mm larger than the diameter of the solid anchor rod body. As a further implementation, after grouting is completed, the grouting pipe is removed and the grouting stop sleeve is reserved at the tail of the solid anchor rod body. As a further implementation mode, the grout stop sleeve is plugged by a rubber plug, and a base plate and a nut are sequentially arranged on the rear side of the rubber plug. In a second aspect, the embodiment of the invention also provides a rapid grouting anchoring device, which comprises the constant-resistance large-deformation anchor rod. As a further implementation, the grouting device further comprises a grouting device, wherein the grouting device is provided with a grouting nozzle, and the grouting nozzle is conne